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71-00-00
ALL ú ú C14 Page 580C ú Jul 12/01
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
////////////////////////A / /
CFM56 ENGINES
737-300/400/500/ /MAINTENANCE MANUAL ////////////////////////
TEST NO. 12 - ENGINE DIAGNOSTIC RUN
___________________________________
TASK 71-00-00-715-031-C00
13. Test No. 12 - Engine Diagnostic Run Test________________________________________
A. General
(1)
This test procedure is given to evaluate engine parameters while the engine is installed on the airplane and to help isolate a possible faulty system. This procedure tests the Main Engine Control (MEC) N2 Speed Governing System, Variable Geometry (VSV/VBV) System, Power Management Control (PMC) System and the Airplane Engine Control for possible system faults. This procedure is intended only as an additional tool to enhance troubleshooting, and is in no way intended to replace the fault isolation charts.
(2)
The engine diagnostic run can be performed before or after any static testing is done.
(3)
For this test, it is necessary to operate each engine at Low and High Idle, Part Power Trim, and Maximum Power Assurance power settings. Procedures for these tests should be performed according to the applicable AMM sections.
(4)
Use the diagnostic run data sheet for this test to record engine parameters (Fig. 501).
(5)
The engine data for the Idle Speed, Acceleration, Part Power, and MPA tests can be collected in one continuous run before analysis. Or, the analysis and related corrective actions can be done after each power level check.
(6)
The Main Engine Control N2 Speed Governing System controls N2 speeds according to PS12, T2, and Power Lever Angle. Incorrect inputs to the MEC or internal faults in the MEC can produce throttle stagger, thrust shortfall, variation in engine dynamics or starting difficulties
(7)
The Variable Geometry System schedules variable stator vane (VSV) and variable bleed vane (VBV) positions according to N2 speed, CDP, and CIT inputs. The Variable Geometry System will affect the N1/N2 speed relationship and incorrect inputs from the associated components will change this speed relationship. Acceleration, throttle stagger and thrust short fall problems can result from Variable Geometry mis-scheduling.
(8) 中国航空网 www.aero.cn 航空翻译 www.aviation.cn 本文链接地址：737-300 400 500 AMM 飞机维护手册 动力装置 POWER PLANT 1(83)
